For Adding Portfolio Filter Make Some Post Of Portfolio. You Will See A Option In Left Side Name With Portfolios. Create Some Post There.
After Creating The Post Go On That Page Where You Want To Set The Portfolio Grid.
Drag And Drop The Portfolio Grid Widget.
After That Will See The Option For Customize It.
Now You Need To Customize It. Select The Style Of Portfolio. Exclude The Post Category, Tags, Post. Or Show All The Portfolio.